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A NAND gate can have two or more inputs. The o on the output means not showing that it is a Not AND gate. The output of a NAND gate is true unless all its inputs are true.

Preset variable resistor A preset is operated with a small screwdriver or similar tool. It is designed to be set when the circuit is made and then left without further adjustment. Presets are cheaper than standard variable resistors so they are sometimes used in projects to reduce the cost.

Voltmeter Measures voltage. The proper name for voltage is potential difference but voltage is more widely used.

An OR gate can have two or more inputs. The output of an OR gate is true when at least one of its inputs is true.